feat(cli): orchestrate full uatu test pipeline

runTestPipeline assembles the v0.1 stack end to end:
  1. Bundle the spec (with @uatu/spec alias resolution)
  2. Extract the embedded sidecar JAR
  3. Spawn java -jar sidecar --port <free>
  4. Wait for sidecar Health
  5. Listen on a host TCP port + adb reverse to the device's
     localabstract:uatu-agent socket
  6. Launch the app via the maestro driver
  7. Accept the SDK HELLO
  8. Load the bundle into the verifier
  9. Open the trace writer + write meta.json
  10. runner.Run for the requested duration
  11. Terminate the app + clean up adb reverse

Test subcommand now prints a bundle error for a missing spec,
verifying the flag surface reaches the pipeline.

cmd/uatu/main.go

@@ -62,8 +62,9 @@ func parseTestArgs(args []string, stderr io.Writer) (testOptions, error) {
 }
 
 func runTest(options testOptions, stdout io.Writer) error {
-	fmt.Fprintf(stdout, "uatu test (stub): %+v\n", options)
-	return nil
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+	return runTestPipeline(ctx, options, stdout)
 }
 
 func runDoctor(stdout io.Writer) error {